Crown ethers and cryptands form:

Discuss the differences in properties observed between lithium and the rest of the alkali metals.

Comment on each of the following observations:
$(a)$ The mobilities of the alkali metal ions in aqueous solution are $Li^{+} < Na^{+} < K^{+} < Rb^{+} < Cs^{+}$
$(b)$ Lithium is the only alkali metal to form a nitride directly.
$(c)$ The standard electrode potential $E^{\circ}$ for the reaction $M^{2+}_{(aq)} + 2e^{-} \to M_{(s)}$ (where $M = Ca, Sr$ or $Ba$) is nearly constant.

Which of the following alkali metals reacts directly with nitrogen?

The $Cs^{+}$ ion imparts a violet color to the flame. This is due to the fact that the emitted radiation has .........

Which one of the following is manufactured by the electrolysis of fused sodium chloride?